Connected: An Internet Encyclopedia
RFC 1334 - 1.1. Specification Requirements

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### 1.1. Specification Requirements

In this document, several words are used to signify the requirements of the specification. These words are often capitalized.

       MUST
          This word, or the adjective "required", means that the definition
          is an absolute requirement of the specification.
       MUST NOT
          This phrase means that the definition is an absolute prohibition
          of the specification.

       SHOULD
          This word, or the adjective "recommended", means that there may
          exist valid reasons in particular circumstances to ignore this
          item, but the full implications should be understood and carefully
          weighed before choosing a different course.

       MAY
          This word, or the adjective "optional", means that this item is
          one of an allowed set of alternatives.  An implementation which
          does not include this option MUST be prepared to interoperate with
          another implementation which does include the option.

Next: 1.2. Terminology

Connected: An Internet Encyclopedia
RFC 1334 - 1.1. Specification Requirements